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- Q373 - Navigation Problems: Chart Plot
30. At Filter Point Light (mile 475 AHP) there are 3 close straight dashed lines on the map passing through the black dot below the number 475. What do these lines represent?
The chart symbol of three close, straight, dashed lines represents overhead power cables, as this is the standard depiction on U.S. inland river charts for multiple power circuits crossing a waterway.
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